package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {

        //切入点
        @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
        public void autoFillPointCut(){

        }

        @Before("autoFillPointCut()")
        public void autoFill(JoinPoint joinPoint){
            log.info("开始进行公共字段填充");

            //获取当前被拦截到的方法是更新还是插入
            MethodSignature signature = (MethodSignature) joinPoint.getSignature();//方法签名对象
            AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获得方法上面的注解 @select @update

            //获得操作类型
            OperationType operationType = autoFill.value();


            //获得被拦截的参数,并且赋值
            Object[] args = joinPoint.getArgs();
            if (args == null && args.length==0){
                return;
            }

            Object entity=args[0];
            //准备赋值的参数
            LocalDateTime now = LocalDateTime.now();
            Long userId = BaseContext.getCurrentId();
            //赋值
            //如果是更新 就设置更新人和更新时间
            //如果是插入 就设置创建人创建时间,修改人,修改时间
            if (operationType == OperationType.INSERT){
                try {
                    Method setCreateTime = entity.getClass().getDeclaredMethod("setCreateTime", LocalDateTime.class);
                    Method setUpdateTime = entity.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);
                    Method setCreateUser = entity.getClass().getDeclaredMethod("setCreateUser", Long.class);
                    Method setUpdateUser = entity.getClass().getDeclaredMethod("setUpdateUser", Long.class);

                    //通过反射来赋值
                    setCreateTime.invoke(entity,now);
                    setUpdateTime.invoke(entity,now);
                    setCreateUser.invoke(entity,userId);
                    setUpdateUser.invoke(entity,userId);
                } catch (Exception e) {
                    throw new RuntimeException(e);
                }


            }else if (operationType == OperationType.UPDATE){
                try {

                    Method setUpdateTime = entity.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);

                    Method setUpdateUser = entity.getClass().getDeclaredMethod("setUpdateUser", Long.class);

                    //通过反射来赋值

                    setUpdateTime.invoke(entity,now);

                    setUpdateUser.invoke(entity,userId);
                } catch (Exception e) {
                    throw new RuntimeException(e);
                }
            }


        }

}
